<div class="users form">
<?php echo $this->Session->flash('auth'); ?>
  <fieldset>
        <legend><?php echo __('Introduzca los datos'); ?></legend>
<?php
    echo $this->Form->create('User', array('action' => 'edit'));

    echo $this->Form->input('username');

    echo $this->Form->input('password');
    echo $this->Form->input('id', array('type' => 'hidden'));

    ?>

</fieldset>

<?php    echo $this->Form->end('Salvar Usuario');?>